Control and coordination in mammals — practice question

Complete the passage by choosing the most suitable scientific term(s). A sensory receptor cell responds to a stimulus by opening ion ................................ in its cell surface membrane. Sodium ions then enter the cell, causing the membrane to become ................................ . This is known as the ................................ potential. If this potential is sufficiently large to reach a ................................ then an action potential is carried to the central nervous system. If the stimulus becomes stronger, the ................................ of action potentials transmitted increases.

Describe the way an action potential is transmitted along a sensory neurone in a mammal.